Which notched trowel should be used for parquet adhesive?

Hello everyone, I am currently thinking about installing parquet myself and since I have underfloor heating, I would like to glue it down. Unfortunately, I am having trouble choosing the right notched trowel and would greatly appreciate a tip. My oak parquet (2-layer) measures 190x2200x14 mm.

I used dental spatula B11. With the same width and thickness.

Thank you very much for the quick response. I had also been eyeing the B11, but I wasn't quite sure.

But the supplier of the parquet will surely be able to give a recommendation. I just took what the supplier said :)

Actually, it doesn't really matter at all. B11 is certainly suitable!

Would have also said B11 or B12.